Anyone else spending more time, looking for pictures to draw then practicing drawing? Any insights? is there a Proko reference pack of images to practice line weights?

Are there any examples of artists doing two methods or even all 3 methods of using line weight (1. outline, 2. show depth, 3. to show light and dark areas) at the same time, i.e. in the same piece? or is this a decision that is made before and then carried through to the end of each piece? Is it common for artists to switch line weight usage, for different pieces? (1 project, line weight is for light/dark, 1 project for depth?)

Hi. I’m looking for the four 3D hand bone models on my dashboard, but can’t seem to locate them. I know this is included in the premium purchases which I believe I did because all my videos say premium stamped on them. Are these files located somewhere else? Thanks for any feedback.